Journal
PHYSICAL REVIEW D
Volume 82, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.82.054008
Keywords
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Funding
- Korean Ministry of Education [KRF-2006-C00011]
- Department of Energy
- National Research Foundation of Korea [2006-0093851] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We investigate the properties of heavy quarkonia at finite temperature in detail using QCD sum rules. Extending previous analyses, we take into account a temperature-dependent effective continuum threshold and derive constraints on the mass, the width, and the varying effective continuum threshold. We find that at least one of these quantities of a charmonium changes abruptly in the vicinity of the phase transition. We also calculate the ratio of the imaginary time correlator to its reconstructed one, G/G(rec), by constructing a model spectral function and compare it to the corresponding lattice QCD results. We demonstrate that the almost constant unity of G/G(rec) can be obtained from the destructive interplay of the changes in each part of the spectral modification which are extracted from QCD sum rules.
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